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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 09-11-2011, 12:03 AM
bcorg bcorg is offline
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5.8 Timing Question HELP!!

I have a 1990 f250 5.8 4X4 that I am getting close to being a daily driver, thanks to the help and advice from this forum. The truck runs very well but after being warmed up and driven a few miles it cranks over hard, almost like a near dead battery. (Battery is brand new.) My search on this forum suggests that my ignition timing might be too far advanced. My Chilton manual seems to indicate that I have the TFI-IV ignition, since it doesn't have a vacuum line to the distributor, and Chilton states that "no ignition timing adjustment is possible and none should be attempted". Do I really have a timing issue and if so, how do I fix it? Thank you in advance for any help!!
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Old 09-11-2011, 12:18 AM
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timbersteel timbersteel is online now
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Yes you do have a TFI ignition system, but...there is a base tiing that must be achieved. Using a timing light, remove the Spout connector and verify @ the timing pointer that the base timing is 10 degrees BTDC. After verifing base timing, plug the Spout connector back in and verify that it advances. Reading your post, I'm more inclined ot think that perhaps the Ignition coil is to blame. Easy check for this is to let the truck sit several hours to cool down, then use a hair dryer or another means of heating the coil up. Once you have got it warm (Not melted), try to start the truck as you have in the past. Is it hard ot start? If so, the coil is most likely on it's way out and it's far better to replace now, rather than in 18 inches of snow like I had mine go out and couldn't get it figured out, except for your idea of a Dead battery.

Also, you TFI module is located on the distributor itself. These are known to fail due to the amout of stress they endure from the vibration, heat and other factors putting them to the extreme due to the location. Ford revised the TFI module to be located on the Driver side Fenderwell with a large aluminium heatsink. Also, try the hairdryer trick with the TFI module "IF" your diagnosis leads you there, ruling out the coil as the culprit.
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1992 F-150 I6 4.9L 300 110K 4x4, SuperCab, Manual
1992 F-150 V8 302 156K 4x4, SuperCab, Auto
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Old 09-11-2011, 12:25 AM
bcorg bcorg is offline
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Thankyou timbersteel!!! I will check intial timing first. Is the spout connecter the plug on the distributor or somewhere else? I wouldn't think it was the distributor plug but I'm fairly new to Fords. Thank you
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Old 09-11-2011, 12:33 AM
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timbersteel timbersteel is online now
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On the dizzy-mounted TFI, I believe it located close to the distributor, but I haven't a system like yours to take a pic. My '90 rebuild is identical to yours, but the harness isn't with me right now. RLA2005, maybe Subford has a pic of it, (I've seen it here several times, try searching for Spout Connector, Subford) but it is a grey Spout connector and it may be wrapped in black electrical fabric tape or if someone has accessed it, it will or should be Grey in color.
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1992 F-150 I6 4.9L 300 110K 4x4, SuperCab, Manual
1992 F-150 V8 302 156K 4x4, SuperCab, Auto
"He's one brick shy of a load..."
"These ideas, evaluations, opinions are representations of real-life scenarios and backed by Murphy's Law..."
"Inferior parts lead to immediate failure sooner than later..."
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Old 09-11-2011, 12:40 AM
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rla2005 rla2005 is offline
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Use this for distributor mounted TFI (aka ICM) modules:

Click the image to open in full size.
courtesy of FordFuelInjection.com

The entire procedure: Ford Fuel Injection » Setting the timing
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Old 09-11-2011, 12:44 AM
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timbersteel timbersteel is online now
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Wow! I didn't think you would be up this late RLA? LOL!

I also included this link showing a pic, courtesy of Subford. RLA, my '90, 302, hasn't got the Spout connector you have shown above, it was just as both of my '92's, 300 and 302.

http://www.ford-trucks.com/forums/10...-question.html

I completely forgot to insert the link earlier...Brain has completely quit functioning @ 1 a.m. Thanks for the diagram RLA2005!
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1992 F-150 I6 4.9L 300 110K 4x4, SuperCab, Manual
1992 F-150 V8 302 156K 4x4, SuperCab, Auto
"He's one brick shy of a load..."
"These ideas, evaluations, opinions are representations of real-life scenarios and backed by Murphy's Law..."
"Inferior parts lead to immediate failure sooner than later..."

Last edited by timbersteel; 09-11-2011 at 12:53 AM. Reason: Completely FORGOT to add the link!!!
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Old 09-11-2011, 12:50 AM
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Here is a line drawing of the remote TFI and spout:
Click the image to open in full size.
courtesy of FordFuelInjection.com

A different pic of a SPOUT for a distributor mounted TFI:
Click the image to open in full size.
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Old 09-11-2011, 12:54 AM
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Quote:
Originally Posted by timbersteel View Post
Wow! I didn't think you would be up this late RLA? LOL!

I also included this link showing a pic, courtesy of Subford. RLA, my '90, 302, hasn't got the Spout connector you have shown above, it was just as both of my '92's, 300 and 302.

http://www.ford-trucks.com/forums/10...-question.html

I completely forgot to insert the link earlier...Brain has completely quit functioning @ 1 a.m. Thanks for the diagram RLA2005!
Insomniac theater.....
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Old 09-11-2011, 12:55 AM
bcorg bcorg is offline
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Fantastic folks!!!! Thank you very much!!!! I'll start by checking timing and then do the coil test. I'm close to having this truck ready for a daily driver I can trust. Thanks again!!!!
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Old 09-11-2011, 12:56 AM
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timbersteel timbersteel is online now
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LOL!

Thanks for the pics RLA! I knew that you and Subford had them and the latter one is of mine. Gonna keep this saved in my fav's and save the picture for future reference with courtesy calls for both of you.
__________________
1992 F-150 I6 4.9L 300 110K 4x4, SuperCab, Manual
1992 F-150 V8 302 156K 4x4, SuperCab, Auto
"He's one brick shy of a load..."
"These ideas, evaluations, opinions are representations of real-life scenarios and backed by Murphy's Law..."
"Inferior parts lead to immediate failure sooner than later..."
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Old 09-11-2011, 12:56 AM
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